Do I have to upgrade Windows 10?

I have an HP Pavilion laptop Windows 10 Home 64 bit constantly trying to upgrade but then I get a message that the Bios needs to be changed. I have no idea how to do that. Do I have to upgrade? If so how? What if I dont upgrade? Can I just turn these messages off?

Have a look at the link and their are other similar threads, just Google.
For your laptop you must obtain the correct BIOS update file from HP. Do this via the HP Help Centre, which will ensure you are directed to the correct link for download. Make sure you have the Laptop Model Number and serial number handy in case the HP Help Centre fails to recognise automatically. Also ensure you are on the HP UK site.
Good luck.

You might like to read this article the short answer is "no you do not have to update Windows 10" Windows will happily keep working even if you never update it. BUT you make your system vulnerable to all kinds of nasties that the updates are designed to catch plus you will not be able to use the extra functions that the updates and upgrades bring to your system.